Hi Guys, I stumbled across issue 270 today, aka 559, 248, 550. A proper fix is waiting for someone willing to fix the plumbing... however I've tested the workaround estabroo proposes in 559, and it works. Here's an example: https://gist.github.com/hintjens/7344533 If you replace the zmq_poll with a sleep, the test fails as we know. -Pieter